add support for skbedit mask

Author: chengzhycn

filter.go

@@ -275,6 +275,7 @@ type SkbEditAction struct {
 	PType        *uint16
 	Priority     *uint32
 	Mark         *uint32
+	Mask         *uint32
 }
 
 func (action *SkbEditAction) Type() string {

filter_linux.go

@@ -597,6 +597,9 @@ func EncodeActions(attr *nl.RtAttr, actions []Action) error {
 			if action.Mark != nil {
 				aopts.AddRtAttr(nl.TCA_SKBEDIT_MARK, nl.Uint32Attr(*action.Mark))
 			}
+			if action.Mask != nil {
+				aopts.AddRtAttr(nl.TCA_SKBEDIT_MASK, nl.Uint32Attr(*action.Mask))
+			}
 		case *ConnmarkAction:
 			table := attr.AddRtAttr(tabIndex, nil)
 			tabIndex++
@@ -739,6 +742,9 @@ func parseActions(tables []syscall.NetlinkRouteAttr) ([]Action, error) {
 						case nl.TCA_SKBEDIT_MARK:
 							mark := native.Uint32(adatum.Value[0:4])
 							action.(*SkbEditAction).Mark = &mark
+						case nl.TCA_SKBEDIT_MASK:
+							mask := native.Uint32(adatum.Value[0:4])
+							action.(*SkbEditAction).Mask = &mask
 						case nl.TCA_SKBEDIT_PRIORITY:
 							priority := native.Uint32(adatum.Value[0:4])
 							action.(*SkbEditAction).Priority = &priority

filter_test.go

@@ -1327,6 +1327,8 @@ func TestFilterU32SkbEditAddDel(t *testing.T) {
 	skbedit.Priority = &priority
 	mark := uint32(0xfe)
 	skbedit.Mark = &mark
+	mask := uint32(0xff)
+	skbedit.Mask = &mask
 	mapping := uint16(0xf)
 	skbedit.QueueMapping = &mapping
 
@@ -1395,6 +1397,9 @@ func TestFilterU32SkbEditAddDel(t *testing.T) {
 	if edit.Mark == nil || *edit.Mark != *skbedit.Mark {
 		t.Fatal("Action Mark doesn't match")
 	}
+	if edit.Mask == nil || *edit.Mask != *skbedit.Mask {
+		t.Fatal("Action Mask doesn't match")
+	}
 	if edit.Priority == nil || *edit.Priority != *skbedit.Priority {
 		t.Fatal("Action Priority doesn't match")
 	}

nl/tc_linux.go

@@ -804,7 +804,8 @@ const (
 	TCA_SKBEDIT_MARK
 	TCA_SKBEDIT_PAD
 	TCA_SKBEDIT_PTYPE
-	TCA_SKBEDIT_MAX = TCA_SKBEDIT_MARK
+	TCA_SKBEDIT_MASK
+	TCA_SKBEDIT_MAX
 )
 
 type TcSkbEdit struct {